U muul Coupon payment $ 3. A 6% coupon bond maturing in 3 years is selling at $950. What is the duration of this bond? Duration years. You are considering adding the above coupon paying bond (from Questions 3) and a zero-coupon bond to your portfolio. The zero-coupon bond matures in 30 years. If your portfolio is 60% the coupon paying bond and 40% the zero-coupon bond, what is the duration of your portfolio? Portfolio duration years